Things you do when you are alone?

There are times when you don't have friends around, the next week this is the case for me. I am wondering what should I do or plan, please recommend if you have any suggestion in mind (not a heavy driver who likes to go on bike rides, not a drinker who likes to drink in pubs alone) Edit: 26-30th is pretty much sorted, Boxing Day MCG full house! Mornings I prefer going to gym and then probably read something later in the day. I want to do something productive ( I know its very subjective, but open for thoughts)